In 1983 the Minnesota Geological Survey, in conjunction with the Minnesota Department of Natural Resources, Division of Minerals, began a geologic sample program involving the chemical analysis of geologic materials, in part submitted by the general public. This Information Circular summarizes the results of that program during the 1989-1991 biennium. In all, 106 samples were evaluated by Survey geologists as potential candidates. In addition we received 115 written and phone requests for information about the program. In the end, only one public sample (Table 1 and 7) was analyzed for a variety of constituents. Also, 308 samples of Archean to Quaternary age submitted by Survey geologists were analyzed for a variety of major, minor, and trace constituents. Tables within those categories are organized by the geologic age of the material analyzed. In addition, 39 samples of water derived from the Hinckley-Mt. Simon aquifer of southeastern Minnesota were analyzed for their trace-element contents (Table 13), as were 33 samples for the del S34 content (Table 14). Effective July 1.1989, the program was discontinued; this is the last report in this series.